I found several IllegalStateException exceptions in the logs:
[#|2009-01-28T14:10:16.050+0100|SEVERE|sun-appserver2.1|javax.enterprise.system.container.web|_
the proper solution is to add the following property under http-listener:
<property name="maxPostSize" value="" />
add/update at the tomcat server xml
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" maxHttpHeaderSize="65536" maxPostSize="4194304"
URIEncoding="UTF-8"/>